PREPARE stmt1 FROM "
SELECT table_name FROM information_schema.tables
WHERE table_name = 't1_first'
UNION ALL
SELECT table_name FROM information_schema.tables
WHERE table_name = 't1_second' ";
execute stmt1;
table_name
execute stmt1;
table_name
create or replace table t1 (a int primary key, table_name char(40 ));
insert into t1 values(1 ,"t1_first" );
insert into t1 values(2 ,"t1_second" );
PREPARE stmt2 FROM "
SELECT table_name FROM t1
WHERE table_name = 't1_first'
UNION ALL
SELECT table_name FROM t1
WHERE table_name = 't1_second' ";
execute stmt2;
table_name
t1_first
t1_second
execute stmt2;
table_name
t1_first
t1_second
flush tables;
execute stmt2;
table_name
t1_first
t1_second
alter table t1 add column b int;
execute stmt2;
table_name
t1_first
t1_second
execute stmt2;
table_name
t1_first
t1_second
drop table t1;
execute stmt2;
ERROR 42 S02: Table 'test.t1' doesn't exist
create or replace table t1 (a int primary key, table_name char(40 ));
insert into t1 values(1 ,"t1_first" );
execute stmt2;
table_name
t1_first
deallocate prepare stmt1;
deallocate prepare stmt2;
drop table t1;
#
# MDEV-25808 PREPARE/EXECUTE makes signed integer out of unsigned
#
prepare p1 from 'select concat(?)' ;
execute p1 using 17864960750176564435 ;
concat(?)
17864960750176564435
prepare p1 from 'select SQRT(?) is not null' ;
execute p1 using 17864960750176564435 ;
SQRT(?) is not null
1
#
# End of 10 .3 tests
#
#
# MDEV-17869 AddressSanitizer: use-after-poison in Item_change_list::rollback_item_tree_changes
#
create table t1 (pk int, v1 varchar(1 ));
insert t1 values (1 ,'v' ),(2 ,'v' ),(3 ,'c' );
create table t2 (pk int, v1 varchar(1 ));
insert t2 values (1 ,'x' );
create table t3 (pk int, i1 int, v1 varchar(1 ));
insert t3 values (10 ,8 ,9 );
execute immediate 'select straight_join 1 from (t1 join t2 on (t1.v1 = t2.v1))
where (3 , 6 ) in (select tc.pk, t3.i1 from (t3 join t1 as tc on (tc.v1 = t3.v1)) having tc.pk > 1 );';
1
drop table t1, t2, t3;
#
# End of 10 .4 tests
#
#
# MDEV-9938 Prepared statement return wrong result (missing row)
#
CREATE TABLE t1 (a_id INT AUTO_INCREMENT PRIMARY KEY, a_text VARCHAR(20 ));
CREATE TABLE t2 (b_id INT AUTO_INCREMENT PRIMARY KEY, b_a_id INT);
INSERT INTO t1 VALUES (NULL, 'word1' );
INSERT INTO t2 VALUES (NULL, 1 ), (NULL, NULL);
PREPARE q FROM 'SELECT * FROM t2
LEFT JOIN t1 ON (t1.a_id = t2.b_a_id)
WHERE ((? IS NULL) OR (t1.a_text = ?))';
SET @var = 'word1' ;
expect row count 1
EXECUTE q USING @var, @var;
b_id b_a_id a_id a_text
1 1 1 word1
expect row count = 2
EXECUTE q USING @nul, @nul;
b_id b_a_id a_id a_text
1 1 1 word1
2 NULL NULL NULL
PREPARE q2 FROM 'SELECT * FROM t2
LEFT JOIN t1 ON (t1.a_id = t2.b_a_id)
WHERE ((? IS NULL) OR (t1.a_text = ?))';
expect row count 2
SET @var = 'word1' ;
EXECUTE q2 USING @nul, @nul;
b_id b_a_id a_id a_text
1 1 1 word1
2 NULL NULL NULL
deallocate prepare q;
deallocate prepare q2;
drop table t1,t2;
#
# End of 10 .6 tests
#
#
# MDEV-40006 : Prepared Statement Crash in varchar_upper_cmp_transformer() for '?'
#
set names utf8mb4;
CREATE TABLE t1 (
id INT,
cs VARCHAR(10 ),
KEY(cs)
) COLLATE=utf8mb4_general_ci;
INSERT INTO t1 (id, cs) VALUES (1 , 'AA1AA' ),(2 , 'BB2BB' ),(3 , 'CC3CC' );
PREPARE s FROM 'SELECT id, cs FROM t1 WHERE UPPER(cs) IN (?, ?)' ;
EXECUTE s USING 'AA1AA' , 'BB2BB' ;
id cs
1 AA1AA
2 BB2BB
deallocate prepare s;
DROP TABLE t1;
set names default;
#
# End of 11 .4 tests
#
Messung V0.5 in Prozent C=60 H=100 G=82
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-10-08)
¤
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